Peng Lixin, Meng Qingyu, Sun Wenjun
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University Harbin 150025 China
RSC Adv. 2019 Jan 18;9(5):2581-2590. doi: 10.1039/c8ra10066g.
Using urea as a precipitation agent, Tb, Eu co-doped YO nanophosphors were synthesized by a homogeneous precipitation method. The sizes of the sample particles were controlled by changing the molar ratio of the urea and rare earth ions. The microstructure and crystallographic structure of the sample were determined through powder X-ray diffraction (PXRD) and field emission scanning electron microscopy (FE-SEM). The test results show that the sample is body centered cubic. As the molar ratio of urea to rare earth ions increases, the size of the sample particles decreases. The temperature-dependent emission spectra of Tb, Eu co-doped YO phosphors with different particle sizes were measured. The results showed that because the fluorescence intensity ratio (FIR) of Tb and Eu varies with temperature, it can be used to visually reflect changes in temperature. In addition, the temperature sensing sensitivity of Tb and Eu co-doped YO phosphors increased upon a decrease in the particle size, but the relative sensitivity decreased with a decrease in the particle size. The physical mechanism of the sensitivity and relative sensitivity changes with the size of the sample particles was also explained.
以尿素为沉淀剂，采用均匀沉淀法合成了Tb、Eu共掺杂的YO纳米磷光体。通过改变尿素与稀土离子的摩尔比来控制样品颗粒的尺寸。通过粉末X射线衍射（PXRD）和场发射扫描电子显微镜（FE-SEM）确定了样品的微观结构和晶体结构。测试结果表明，样品为体心立方结构。随着尿素与稀土离子摩尔比的增加，样品颗粒尺寸减小。测量了不同粒径的Tb、Eu共掺杂YO磷光体的温度依赖发射光谱。结果表明，由于Tb和Eu的荧光强度比（FIR）随温度变化，因此可用于直观反映温度变化。此外，Tb、Eu共掺杂YO磷光体的温度传感灵敏度随粒径减小而增加，但相对灵敏度随粒径减小而降低。还解释了灵敏度和相对灵敏度随样品颗粒尺寸变化的物理机制。
